diff --git a/readme.md b/readme.md
index 1e55f19..20407be 100644
--- a/readme.md
+++ b/readme.md
@@ -12,7 +12,7 @@ Aliyun oss filesystem storage adapter for laravel 5. You can use Aliyun OSS just
 ##Installation
 In order to install AliOSS-storage, just add
 
-    "jacobcyl/ali-oss-storage": "^2.0"
+    "jacobcyl/ali-oss-storage": "^2.1"
 
 to your composer.json. Then run `composer install` or `composer update`.  
 Or you can simply run below command to install: